2123828191 has 2 divisors, whose sum is σ = 2123828192. Its totient is φ = 2123828190.

The previous prime is 2123828171. The next prime is 2123828221. The reversal of 2123828191 is 1918283212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123828191 - 2⁵ = 2123828159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123828191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123828131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061914095 + 1061914096.

It is an arithmetic number, because the mean of its divisors is an integer number (1061914096).

Almost surely, 2^2123828191 is an apocalyptic number.

2123828191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123828191 is an equidigital number, since it uses as much as digits as its factorization.

2123828191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 37.

The square root of 2123828191 is about 46085.0104806324. The cubic root of 2123828191 is about 1285.4044341591.

The spelling of 2123828191 in words is "two billion, one hundred twenty-three million, eight hundred twenty-eight thousand, one hundred ninety-one".